Hydraulic Fluids

Castrol has developed a wide range of fluids to cover nearly every possible application.

Hydraulic, turbine and circulating oils are typically lighter viscosity fluids used for a variety of lubricating needs, including hydraulic systems, pumps, bearings, turbines, compressors, motors, general purpose moving components, air line lubricators and many others.

These fluids have been formulated using the latest technology in raw materials. In addition, they have undergone rigorous testing in both laboratory and manufacturing conditions, in collaboration with leading hydraulic system and machinery manufacturers.

Wide Range to Meet all Your Needs

Castrol has developed a range of hydraulic and circulating oils, from premium R&O fluids to the highest performing anti-wear hydraulic oils, that provide the performance required for a wide variety of applications. Highly refined base oils are used to provide long life and clean-running benefits along with the latest additive technologies, including zinc-free options that support environmental initiatives and improve performance in sensitive applications

Excellent Wear Protection

Protecting metal components from wear is one of the most important properties of an oil. Castrol utilizes numerous wear tests to validate that Castrol oils will provide long equipment life, including 4-ball wear, SRV (coefficient of friction test), FZG (rigorous EP gear oil test) and pump OEM tests, which measure actual wear of a hydraulic pump (Eaton 35VQ25, Denison HF-0). Castrol Tribol HM 943 achieves outstanding performance in the Eaton vane pump test with less than 10 mg of wear.

Eaton vane pump component after testing with Tribol HM 943 showing virtually no wear (<10 mg).

Extremely Long Oil Life and Low Varnish

In addition to wear protection, a hydraulic fluid should provide long life and reduce operational anomalies while maintaining a clean system that reduces maintenance time and cost associated with fluid cleanouts. Tribol HM 943 is formulated to provide the industry’s best oxidation resistance for a mineral oil, approaching – and often exceeding – the performance of synthetics. It achieves over 18,000 hours in the TOST test (ASTM D 943) as compared to premium fluids, which often attain only 6,000 hours.

Tribol HM 943 demonstrates oxidation resistance far superior to conventional and even premium hydraulic oils.

Hydraulic Fluids Selection Chart

PRODUCT NAME	ISO VGs Available	Base Oil	Additives1	Viscosity Index	Zinc	Flash Point Range3	Pour Point Range3	Oxidation Resistance2	Pressure Range
Hydraulic & Circulating Oils
Hyspin VG	32 - 220	Mineral	R&O	95	No	410 - 469°F	-22 to +14°F	✓✓	n/a
Hyspin AWS	15 - 150	Mineral	AW	> 95	Yes	383 - 450°F	-27 to +5°F	✓	5000+ psi
Hyspin ZZ	32 - 68	Mineral	AW	> 95	No	410 - 439°F	-17 to -11°F	✓✓	5000+ psi
Hyspin AWH-M	15, 32-150	Mineral	AW / VII	> 130-150	Yes	401 - 450°F	-60 to -22°F	✓	5000+ psi
Hyspin HVI	15, 32, 46	Mineral	AW / VII	> 150	No	320 - 428°F	-54 to -33°F	✓✓	5000+ psi
Tribol HM 943	22 - 100	Mineral	AW	> 100	No	374 - 486°F	-34 to -11°F	✓✓✓	7500+ psi
Spindle Oils
Hyspin Spindle Oil	2, 10, 22	Mineral	R&O	86-100	No	176°F (2) 295°F (10) 414°F (22)	-40 to -22°F	✓✓	n/a
Hyspin Spindle Oil HS	2	Mineral	AW	n/a	Yes	200°F	n/a	✓✓	n/a
Turbine Oils
Perfecto X	32 - 68	Mineral	R&O	112	No	432 - 453°F	+5 to +10°F	✓✓✓	n/a
Perfecto XEP	46	Mineral	AW	112	No	453°F	+5°F	✓✓✓	n/a
Environmentally Responsible
Performance Bio HE PBL	32 - 46	Plant-based	AW	206 - 217	Yes	460 - 580°F	n/a	✓	< 5000 psi
Performance Bio HE ESU	46	Synthetic Ester	AW	185	No	518°F	-17°F	✓✓✓	7500+ psi
Fire-Resistant Hydraulic Fluids
Anvol SWX	46, 68	Polyol Ester	AW	180	No	> 536°F	-33 to -27°F	✓✓✓	7500+ psi
Anvol WG	46	Water Glycol	AW	> 200	No	n/a	-60°F	n/a	< 3000 psi
Specialty Circulating Oils
Magna CTX WT (steel mill circulating oil)	460, 680	Mineral	AW	92 - 97	No	469 - 475°F	+16 to +21°F	✓✓	n/a
Tribol CT 1740 (paper machine oil)	220, 320	Semi-Synthetic	AW	145	No	510°F	-13 to -3°F	✓✓✓	n/a
Food Grade Hydraulic Oil
Optileb HY	32, 46, 68	Synthetic PAO	AW	136 - 143	No	426 - 468°F	-58 to -49°F	✓✓✓	7500+ psi

1 R&O = Rust & Oxidation inhibitors AW = Anti-wear VII = VI improver
2 Increasing performance from 1 to 3 checks
3 Varies by viscosity grade